drivers/crypto/cavium/cpt/cptvf_algs.c

   1
   2 /*
   3  * Copyright (C) 2016 Cavium, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License
   7  * as published by the Free Software Foundation.
   8  */
   9
  10 #include <crypto/aes.h>
  11 #include <crypto/algapi.h>
  12 #include <crypto/authenc.h>
  13 #include <crypto/cryptd.h>
  14 #include <crypto/crypto_wq.h>
  15 #include <crypto/des.h>
  16 #include <crypto/xts.h>
  17 #include <linux/crypto.h>
  18 #include <linux/err.h>
  19 #include <linux/list.h>
  20 #include <linux/scatterlist.h>
  21
  22 #include "cptvf.h"
  23 #include "cptvf_algs.h"
  24
  25 struct cpt_device_handle {
  26         void *cdev[MAX_DEVICES];
  27         u32 dev_count;
  28 };
  29
  30 static struct cpt_device_handle dev_handle;
  31
  32 static void cvm_callback(u32 status, void *arg)
  33 {
  34         struct crypto_async_request *req = (struct crypto_async_request *)arg;
  35
  36         req->complete(req, !status);
  37 }
  38
  39 static inline void update_input_iv(struct cpt_request_info *req_info,
  40                                    u8 *iv, u32 enc_iv_len,
  41                                    u32 *argcnt)
  42 {
  43         /* Setting the iv information */
  44         req_info->in[*argcnt].vptr = (void *)iv;
  45         req_info->in[*argcnt].size = enc_iv_len;
  46         req_info->req.dlen += enc_iv_len;
  47
  48         ++(*argcnt);
  49 }
  50
  51 static inline void update_output_iv(struct cpt_request_info *req_info,
  52                                     u8 *iv, u32 enc_iv_len,
  53                                     u32 *argcnt)
  54 {
  55         /* Setting the iv information */
  56         req_info->out[*argcnt].vptr = (void *)iv;
  57         req_info->out[*argcnt].size = enc_iv_len;
  58         req_info->rlen += enc_iv_len;
  59
  60         ++(*argcnt);
  61 }
  62
  63 static inline void update_input_data(struct cpt_request_info *req_info,
  64                                      struct scatterlist *inp_sg,
  65                                      u32 nbytes, u32 *argcnt)
  66 {
  67         req_info->req.dlen += nbytes;
  68
  69         while (nbytes) {
  70                 u32 len = min(nbytes, inp_sg->length);
  71                 u8 *ptr = sg_virt(inp_sg);
  72
  73                 req_info->in[*argcnt].vptr = (void *)ptr;
  74                 req_info->in[*argcnt].size = len;
  75                 nbytes -= len;
  76
  77                 ++(*argcnt);
  78                 ++inp_sg;
  79         }
  80 }
  81
  82 static inline void update_output_data(struct cpt_request_info *req_info,
  83                                       struct scatterlist *outp_sg,
  84                                       u32 nbytes, u32 *argcnt)
  85 {
  86         req_info->rlen += nbytes;
  87
  88         while (nbytes) {
  89                 u32 len = min(nbytes, outp_sg->length);
  90                 u8 *ptr = sg_virt(outp_sg);
  91
  92                 req_info->out[*argcnt].vptr = (void *)ptr;
  93                 req_info->out[*argcnt].size = len;
  94                 nbytes -= len;
  95                 ++(*argcnt);
  96                 ++outp_sg;
  97         }
  98 }
  99
 100 static inline u32 create_ctx_hdr(struct ablkcipher_request *req, u32 enc,
 101                                  u32 *argcnt)
 102 {
 103         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 104         struct cvm_enc_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 105         struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
 106         struct fc_context *fctx = &rctx->fctx;
 107         u64 *offset_control = &rctx->control_word;
 108         u32 enc_iv_len = crypto_ablkcipher_ivsize(tfm);
 109         struct cpt_request_info *req_info = &rctx->cpt_req;
 110         u64 *ctrl_flags = NULL;
 111
 112         req_info->ctrl.s.grp = 0;
 113         req_info->ctrl.s.dma_mode = DMA_GATHER_SCATTER;
 114         req_info->ctrl.s.se_req = SE_CORE_REQ;
 115
 116         req_info->req.opcode.s.major = MAJOR_OP_FC |
 117                                         DMA_MODE_FLAG(DMA_GATHER_SCATTER);
 118         if (enc)
 119                 req_info->req.opcode.s.minor = 2;
 120         else
 121                 req_info->req.opcode.s.minor = 3;
 122
 123         req_info->req.param1 = req->nbytes; /* Encryption Data length */
 124         req_info->req.param2 = 0; /*Auth data length */
 125
 126         fctx->enc.enc_ctrl.e.enc_cipher = ctx->cipher_type;
 127         fctx->enc.enc_ctrl.e.aes_key = ctx->key_type;
 128         fctx->enc.enc_ctrl.e.iv_source = FROM_DPTR;
 129
 130         if (ctx->cipher_type == AES_XTS)
 131                 memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len * 2);
 132         else
 133                 memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len);
 134         ctrl_flags = (u64 *)&fctx->enc.enc_ctrl.flags;
 135         *ctrl_flags = cpu_to_be64(*ctrl_flags);
 136
 137         *offset_control = cpu_to_be64(((u64)(enc_iv_len) << 16));
 138         /* Storing  Packet Data Information in offset
 139          * Control Word First 8 bytes
 140          */
 141         req_info->in[*argcnt].vptr = (u8 *)offset_control;
 142         req_info->in[*argcnt].size = CONTROL_WORD_LEN;
 143         req_info->req.dlen += CONTROL_WORD_LEN;
 144         ++(*argcnt);
 145
 146         req_info->in[*argcnt].vptr = (u8 *)fctx;
 147         req_info->in[*argcnt].size = sizeof(struct fc_context);
 148         req_info->req.dlen += sizeof(struct fc_context);
 149
 150         ++(*argcnt);
 151
 152         return 0;
 153 }
 154
 155 static inline u32 create_input_list(struct ablkcipher_request  *req, u32 enc,
 156                                     u32 enc_iv_len)
 157 {
 158         struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
 159         struct cpt_request_info *req_info = &rctx->cpt_req;
 160         u32 argcnt =  0;
 161
 162         create_ctx_hdr(req, enc, &argcnt);
 163         update_input_iv(req_info, req->info, enc_iv_len, &argcnt);
 164         update_input_data(req_info, req->src, req->nbytes, &argcnt);
 165         req_info->incnt = argcnt;
 166
 167         return 0;
 168 }
 169
 170 static inline void store_cb_info(struct ablkcipher_request *req,
 171                                  struct cpt_request_info *req_info)
 172 {
 173         req_info->callback = (void *)cvm_callback;
 174         req_info->callback_arg = (void *)&req->base;
 175 }
 176
 177 static inline void create_output_list(struct ablkcipher_request *req,
 178                                       u32 enc_iv_len)
 179 {
 180         struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
 181         struct cpt_request_info *req_info = &rctx->cpt_req;
 182         u32 argcnt = 0;
 183
 184         /* OUTPUT Buffer Processing
 185          * AES encryption/decryption output would be
 186          * received in the following format
 187          *
 188          * ------IV--------|------ENCRYPTED/DECRYPTED DATA-----|
 189          * [ 16 Bytes/     [   Request Enc/Dec/ DATA Len AES CBC ]
 190          */
 191         /* Reading IV information */
 192         update_output_iv(req_info, req->info, enc_iv_len, &argcnt);
 193         update_output_data(req_info, req->dst, req->nbytes, &argcnt);
 194         req_info->outcnt = argcnt;
 195 }
 196
 197 static inline int cvm_enc_dec(struct ablkcipher_request *req, u32 enc)
 198 {
 199         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 200         struct cvm_req_ctx *rctx = ablkcipher_request_ctx(req);
 201         u32 enc_iv_len = crypto_ablkcipher_ivsize(tfm);
 202         struct fc_context *fctx = &rctx->fctx;
 203         struct cpt_request_info *req_info = &rctx->cpt_req;
 204         void *cdev = NULL;
 205         int status;
 206
 207         memset(req_info, 0, sizeof(struct cpt_request_info));
 208         memset(fctx, 0, sizeof(struct fc_context));
 209         create_input_list(req, enc, enc_iv_len);
 210         create_output_list(req, enc_iv_len);
 211         store_cb_info(req, req_info);
 212         cdev = dev_handle.cdev[smp_processor_id()];
 213         status = cptvf_do_request(cdev, req_info);
 214         /* We perform an asynchronous send and once
 215          * the request is completed the driver would
 216          * intimate through  registered call back functions
 217          */
 218
 219         if (status)
 220                 return status;
 221         else
 222                 return -EINPROGRESS;
 223 }
 224
 225 static int cvm_encrypt(struct ablkcipher_request *req)
 226 {
 227         return cvm_enc_dec(req, true);
 228 }
 229
 230 static int cvm_decrypt(struct ablkcipher_request *req)
 231 {
 232         return cvm_enc_dec(req, false);
 233 }
 234
 235 static int cvm_xts_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 236                    u32 keylen)
 237 {
 238         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 239         struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
 240         int err;
 241         const u8 *key1 = key;
 242         const u8 *key2 = key + (keylen / 2);
 243
 244         err = xts_check_key(tfm, key, keylen);
 245         if (err)
 246                 return err;
 247         ctx->key_len = keylen;
 248         memcpy(ctx->enc_key, key1, keylen / 2);
 249         memcpy(ctx->enc_key + KEY2_OFFSET, key2, keylen / 2);
 250         ctx->cipher_type = AES_XTS;
 251         switch (ctx->key_len) {
 252         case 32:
 253                 ctx->key_type = AES_128_BIT;
 254                 break;
 255         case 64:
 256                 ctx->key_type = AES_256_BIT;
 257                 break;
 258         default:
 259                 return -EINVAL;
 260         }
 261
 262         return 0;
 263 }
 264
 265 static int cvm_validate_keylen(struct cvm_enc_ctx *ctx, u32 keylen)
 266 {
 267         if ((keylen == 16) || (keylen == 24) || (keylen == 32)) {
 268                 ctx->key_len = keylen;
 269                 switch (ctx->key_len) {
 270                 case 16:
 271                         ctx->key_type = AES_128_BIT;
 272                         break;
 273                 case 24:
 274                         ctx->key_type = AES_192_BIT;
 275                         break;
 276                 case 32:
 277                         ctx->key_type = AES_256_BIT;
 278                         break;
 279                 default:
 280                         return -EINVAL;
 281                 }
 282
 283                 if (ctx->cipher_type == DES3_CBC)
 284                         ctx->key_type = 0;
 285
 286                 return 0;
 287         }
 288
 289         return -EINVAL;
 290 }
 291
 292 static int cvm_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 293                       u32 keylen, u8 cipher_type)
 294 {
 295         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
 296         struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
 297
 298         ctx->cipher_type = cipher_type;
 299         if (!cvm_validate_keylen(ctx, keylen)) {
 300                 memcpy(ctx->enc_key, key, keylen);
 301                 return 0;
 302         } else {
 303                 crypto_ablkcipher_set_flags(cipher,
 304                                             CRYPTO_TFM_RES_BAD_KEY_LEN);
 305                 return -EINVAL;
 306         }
 307 }
 308
 309 static int cvm_cbc_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 310                               u32 keylen)
 311 {
 312         return cvm_setkey(cipher, key, keylen, AES_CBC);
 313 }
 314
 315 static int cvm_ecb_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 316                               u32 keylen)
 317 {
 318         return cvm_setkey(cipher, key, keylen, AES_ECB);
 319 }
 320
 321 static int cvm_cfb_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 322                               u32 keylen)
 323 {
 324         return cvm_setkey(cipher, key, keylen, AES_CFB);
 325 }
 326
 327 static int cvm_cbc_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 328                                u32 keylen)
 329 {
 330         return cvm_setkey(cipher, key, keylen, DES3_CBC);
 331 }
 332
 333 static int cvm_ecb_des3_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
 334                                u32 keylen)
 335 {
 336         return cvm_setkey(cipher, key, keylen, DES3_ECB);
 337 }
 338
 339 static int cvm_enc_dec_init(struct crypto_tfm *tfm)
 340 {
 341         struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
 342
 343         memset(ctx, 0, sizeof(*ctx));
 344         tfm->crt_ablkcipher.reqsize = sizeof(struct cvm_req_ctx) +
 345                                         sizeof(struct ablkcipher_request);
 346         /* Additional memory for ablkcipher_request is
 347          * allocated since the cryptd daemon uses
 348          * this memory for request_ctx information
 349          */
 350
 351         return 0;
 352 }
 353
 354 static struct crypto_alg algs[] = { {
 355         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 356         .cra_blocksize = AES_BLOCK_SIZE,
 357         .cra_ctxsize = sizeof(struct cvm_enc_ctx),
 358         .cra_alignmask = 7,
 359         .cra_priority = 4001,
 360         .cra_name = "xts(aes)",
 361         .cra_driver_name = "cavium-xts-aes",
 362         .cra_type = &crypto_ablkcipher_type,
 363         .cra_u = {
 364                 .ablkcipher = {
 365                         .ivsize = AES_BLOCK_SIZE,
 366                         .min_keysize = 2 * AES_MIN_KEY_SIZE,
 367                         .max_keysize = 2 * AES_MAX_KEY_SIZE,
 368                         .setkey = cvm_xts_setkey,
 369                         .encrypt = cvm_encrypt,
 370                         .decrypt = cvm_decrypt,
 371                 },
 372         },
 373         .cra_init = cvm_enc_dec_init,
 374         .cra_module = THIS_MODULE,
 375 }, {
 376         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 377         .cra_blocksize = AES_BLOCK_SIZE,
 378         .cra_ctxsize = sizeof(struct cvm_enc_ctx),
 379         .cra_alignmask = 7,
 380         .cra_priority = 4001,
 381         .cra_name = "cbc(aes)",
 382         .cra_driver_name = "cavium-cbc-aes",
 383         .cra_type = &crypto_ablkcipher_type,
 384         .cra_u = {
 385                 .ablkcipher = {
 386                         .ivsize = AES_BLOCK_SIZE,
 387                         .min_keysize = AES_MIN_KEY_SIZE,
 388                         .max_keysize = AES_MAX_KEY_SIZE,
 389                         .setkey = cvm_cbc_aes_setkey,
 390                         .encrypt = cvm_encrypt,
 391                         .decrypt = cvm_decrypt,
 392                 },
 393         },
 394         .cra_init = cvm_enc_dec_init,
 395         .cra_module = THIS_MODULE,
 396 }, {
 397         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 398         .cra_blocksize = AES_BLOCK_SIZE,
 399         .cra_ctxsize = sizeof(struct cvm_enc_ctx),
 400         .cra_alignmask = 7,
 401         .cra_priority = 4001,
 402         .cra_name = "ecb(aes)",
 403         .cra_driver_name = "cavium-ecb-aes",
 404         .cra_type = &crypto_ablkcipher_type,
 405         .cra_u = {
 406                 .ablkcipher = {
 407                         .ivsize = AES_BLOCK_SIZE,
 408                         .min_keysize = AES_MIN_KEY_SIZE,
 409                         .max_keysize = AES_MAX_KEY_SIZE,
 410                         .setkey = cvm_ecb_aes_setkey,
 411                         .encrypt = cvm_encrypt,
 412                         .decrypt = cvm_decrypt,
 413                 },
 414         },
 415         .cra_init = cvm_enc_dec_init,
 416         .cra_module = THIS_MODULE,
 417 }, {
 418         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 419         .cra_blocksize = AES_BLOCK_SIZE,
 420         .cra_ctxsize = sizeof(struct cvm_enc_ctx),
 421         .cra_alignmask = 7,
 422         .cra_priority = 4001,
 423         .cra_name = "cfb(aes)",
 424         .cra_driver_name = "cavium-cfb-aes",
 425         .cra_type = &crypto_ablkcipher_type,
 426         .cra_u = {
 427                 .ablkcipher = {
 428                         .ivsize = AES_BLOCK_SIZE,
 429                         .min_keysize = AES_MIN_KEY_SIZE,
 430                         .max_keysize = AES_MAX_KEY_SIZE,
 431                         .setkey = cvm_cfb_aes_setkey,
 432                         .encrypt = cvm_encrypt,
 433                         .decrypt = cvm_decrypt,
 434                 },
 435         },
 436         .cra_init = cvm_enc_dec_init,
 437         .cra_module = THIS_MODULE,
 438 }, {
 439         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 440         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
 441         .cra_ctxsize = sizeof(struct cvm_des3_ctx),
 442         .cra_alignmask = 7,
 443         .cra_priority = 4001,
 444         .cra_name = "cbc(des3_ede)",
 445         .cra_driver_name = "cavium-cbc-des3_ede",
 446         .cra_type = &crypto_ablkcipher_type,
 447         .cra_u = {
 448                 .ablkcipher = {
 449                         .min_keysize = DES3_EDE_KEY_SIZE,
 450                         .max_keysize = DES3_EDE_KEY_SIZE,
 451                         .ivsize = DES_BLOCK_SIZE,
 452                         .setkey = cvm_cbc_des3_setkey,
 453                         .encrypt = cvm_encrypt,
 454                         .decrypt = cvm_decrypt,
 455                 },
 456         },
 457         .cra_init = cvm_enc_dec_init,
 458         .cra_module = THIS_MODULE,
 459 }, {
 460         .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 461         .cra_blocksize = DES3_EDE_BLOCK_SIZE,
 462         .cra_ctxsize = sizeof(struct cvm_des3_ctx),
 463         .cra_alignmask = 7,
 464         .cra_priority = 4001,
 465         .cra_name = "ecb(des3_ede)",
 466         .cra_driver_name = "cavium-ecb-des3_ede",
 467         .cra_type = &crypto_ablkcipher_type,
 468         .cra_u = {
 469                 .ablkcipher = {
 470                         .min_keysize = DES3_EDE_KEY_SIZE,
 471                         .max_keysize = DES3_EDE_KEY_SIZE,
 472                         .ivsize = DES_BLOCK_SIZE,
 473                         .setkey = cvm_ecb_des3_setkey,
 474                         .encrypt = cvm_encrypt,
 475                         .decrypt = cvm_decrypt,
 476                 },
 477         },
 478         .cra_init = cvm_enc_dec_init,
 479         .cra_module = THIS_MODULE,
 480 } };
 481
 482 static inline int cav_register_algs(void)
 483 {
 484         int err = 0;
 485
 486         err = crypto_register_algs(algs, ARRAY_SIZE(algs));
 487         if (err)
 488                 return err;
 489
 490         return 0;
 491 }
 492
 493 static inline void cav_unregister_algs(void)
 494 {
 495         crypto_unregister_algs(algs, ARRAY_SIZE(algs));
 496 }
 497
 498 int cvm_crypto_init(struct cpt_vf *cptvf)
 499 {
 500         struct pci_dev *pdev = cptvf->pdev;
 501         u32 dev_count;
 502
 503         dev_count = dev_handle.dev_count;
 504         dev_handle.cdev[dev_count] = cptvf;
 505         dev_handle.dev_count++;
 506
 507         if (dev_count == 3) {
 508                 if (cav_register_algs()) {
 509                         dev_err(&pdev->dev, "Error in registering crypto algorithms\n");
 510                         return -EINVAL;
 511                 }
 512         }
 513
 514         return 0;
 515 }
 516
 517 void cvm_crypto_exit(void)
 518 {
 519         u32 dev_count;
 520
 521         dev_count = --dev_handle.dev_count;
 522         if (!dev_count)
 523                 cav_unregister_algs();
 524 }